Cosmetic composition, cosmetic treatment method, kit, and compound

A method for the cosmetic treatment of a keratin material, comprising applying to said material a cosmetic composition comprising, in a physiologically acceptable medium, at least one compound of formula (I), salts thereof, isomers thereof, solvates thereof, and the tautomeric forms thereof:

• in which:
• R1 and R2, independently of one another, represent H, —OH, —NRR′, wherein R and R′, individually are H or a linear or branched C1-C12 alkyl radical;
• or a carbon-based group, which optionally contains one or more heteroatoms;
• Z represents a monovalent radical chosen from:
• (i) a hydrogen atom,
• (ii) a linear or branched C1 to C32 alkyl radical,
• (iii) a linear or branched C2 to C32 alkene radical, comprising one or two C═C double bonds;
• (iv) a C1-C32 alkyl group substituted with a C6-C10 aryl group and optionally substituted with 1 to 8 groups chosen from —OH, —OR, —SH, —SR, —SO3H, —SO3R, —SO2NRR′, —COOH, —COOR, —CONRR′, —NR—C(O)—NRR′, —NRR′ and —N+RR′R″, with each R, R′ and R″ individually being H or C1-C6 alkyl;
• and the substituents of formula (a) to (h) below:
• and/or optionally said radicals comprise 1 to 8 groups chosen from, alone or as a mixture, —S—, S(O), SO2, —NH— (or ═NH), —N=(trivalent), —O—, —C(O)—, —C(═NH)—, —N+(CH3)2-An− (An−:
• anion)n.